Revolving door



D. C. SMITH. REVOLVlNG DOOR. APPLICATION FILED MAY 28. \915.

Tatented May 13, 1919.

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DATUS C. SMITH, OF KINDERHOOK, NEW YORK.

REVOLVING DOOR.

Specification of Letters Patent.

Patented May 13, 1919.

Application filed May 28, 1918. Serial No. 237,041.

To all whom it may concern: a N

Be it known that I, DATUS C. SMITH, a citizen of the United States, residing at Kinderhook, in the county of Columbia and State of New York, have invented certain new and useful Improvements in Revolving Doors; and I do hereby declare the following to be afull, clear, and exact description of the invention,'such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to revolvin doors of the type used at the entrance to 0 0e and other buildings to afford a passage-way and at the same time prevent cold air from entering the building.

The objects of the invention are to provide a revolving door of the character referred to with an eccentric casing adapted to prevent excessive wear upon the flexible extensions or elastic strips on the edges of the door members or wings by contact with the side walls of the casing and to lessen the noise and force usually required to move the door about its axis.

As heretofore ordinarily constructed revolving doors of the class to which my invention relates have been provided with casings whose confronting surfaces with which the elastic strips on the outer edges of the door member contact, are concentric with the axis of the door, and such elastic strips are caused to strike the casing or edges thereof, 1 produclng a disagreeable nolse and causlng' excesslve wear, and such strips are also caused to make close contact with the inner walls of the casing the entire length thereof, with consequent friction and wear, so as to necessitate frequent renewal in order to render the door effectual in preventing the entrance of cold air in'extremely cold weather.

The invention will first be hereinafter more particularly described, with reference to the accompanying drawings, which are to be taken as a part of this specification, and then pointed out in the claims at the end of the description.

In said drawings Figure 1 is a horizontal sectional view of a revolving door with an eccentric casing embodying my invention. a

Fig. 2 is a horizontal sectional view illustrating a modification of the casing.

Figs. 3 and 4 are detail horizontal sectional views illustrating different modifications of the casing.

Referring to said drawings, in which the same reference letters are used to denote corresponding parts in different views, the letter A, may denote the walls of a building adJacent a passage-way therethrough in which is fitted opposed members B, B, of a door-casing between which is revolubly mounted a door C, having four, moreor less, wings which radiate from a common center of the axis of the door and on the outer edges of which are secured elastic strips 0 such as are commonly employed in this class of devices, adapted to contact with the adjacent curved walls of'the casing members B, on opposite sides of said passage-way so as to provide an entrance and exit opening on each side which is controlled by the re volving door in the usual manner and a substantially air-tight contact maintained between the confronting walls of the casing and the elastic strips in contact therewith, so as to prevent the entrance of cold air between said walls and the door. In the preferred form of the invention illustrated in Fig. 1 of the drawings, the casing members are each in the form of an arc of a circle arranged eccentric to the center of the 1 strike the casing but may enter without touching at the start and be gradually brought into contact therewith and caused to approach nearer and nearer with gradually increasing friction until near the opposite or exit end of the casing. This arrangement prevents excessive wear upon the flexible extensions of thedoor or the elastic strips on the edges of the radial wings, and also prevents the disagreeable noise that is so noticeable in the operation of revolving doors of the same general construction as heretofore constructed, and less effort is required to rotate the door.

A further advantage of the described construction is that there is a marked tendency of the door, with proper adjustment, to stop at the desired point, to effectually exclude air from the building while the door remains stationary, that is, with the diametrically opposite elastic strips impinging tightly against the walls of the casing at the exit ends thereof, and the elastic strips on the other two wings just beginning to touch the casing at the entrance end, so that the entrance of air between the casing walls and the door at both the outgoing and incoming side of the door is prevented when the door is in such position.

Instead of the casing members being in the form of a true circle, non-concentric with the center-of the door, they may be composed of separablevor integral sections with a step-by-step formation, as indicated in Fig. 2 of the drawings, wherein each casing member is composed of a series of curved sections,v each concentric with the center of the door and off-set slightly at their meeting edges, so that the. space between the door and the walls of the casing gradually diminishes in width, step-by-step, from the entrance end of the casing to the exit end thereof, at each side of the passageway through which a person may enter or leave the building; the several sections, taken as a whole, forming substantially the arc of a circle non-concentric with the center of the door. Obviously, various other modifications may be made without departing from the spirit and scope of my invention, the essential feature of which resides in constructing the casing member so that the elastic extensions or strips on the wings of the door may enter the casing without touching at thestart and be brought gradually into contact with the casing wall, such contact being continued with increasing force and friction toward the exit end of the casing, so as to effectually prevent the entrance of cold air between the door and easing from an intermediate point, at which the elastic strips are brought into contact with the walls of the casing, to the exit end.

In the modification shown in Fig. 3 of the drawings, the casing members are each constructed with an entrance end portion 6 which is inclined tangentially to the surface of an adjoining curved section 6 arranged substantially concentric with the center of the door, so that the door may enter the casing without touching, or substantial' contact therewith, as in the case of the previously described constructions, and on continued forward movement will contact with increasing pressure in the direction of'movement until the contacting Wing extension has passed the junction of the inclined and curved sections; the general effect of such arrangement being that the combined sections as a whole form a structure substantially concentric with a circle eccentric to the center of the door. This is also true of the modification shown in Fig. 4, wherein there are two curved sections, the one marked 79*, being eccentric to the center of the door, while the. other marked 6 is concentric with the center of-the door. In

this instance contact is made with the foremost section as the door wing enters the casing and is continued with increased pressure until the concentric section is reached and from this point on the same pressurecontact is maintained.

Having thus described my invention, what I claim and desire to secure by Letters Patent of the United States, is

1. In combination with a revolving door, a casing having curved confronting walls between which the door is revolubly mounted, said door having radially projecting wings provided with elastic extensions or strips on their outer edges, and said walls being arranged eccentric to the axis of the door and nearer said axis at the exit than, at the entrance end of the casing, whereby a gradually increasing frictional resistance is exerted against the movement of the door members toward the exit end of the casing.

2. In combination with a revolving door, opposed casing members each constructed on the arc of a circle and having a curved surface facing the door, said surface being ar ranged eccentrically to the circumference of a circle concentric with the center of the door, the outer edges of said casing members at the exits being nearer the pivotal center of the door than the entrance edges, whereby a gradually increasing frictional resistance is exerted against the movement of the door members toward the exit end of the casing.

3. In combination with a revolving door, a casing composed of opposed members having concave confronting surfaces between which the door is revolubly mounted, said door having radially extending wings provided with elastic marginal strips or extensions, the concave surfaces of said casing members being arranged eccentric to the axis of the door and nearer said axis at the exit than at the entrance end of the casing, whereby the frictional resistance exerted against movement of the door members increases as they approach the exit end of the casing.

4. In combination, a door casing composed of opposed members each having a portion curved upon the arc of a circle, and a door revolublymounted between said members having radially projecting wings with elastic portions on their outer edges adapted to contact with said curved surfaces only after entering the casing, said surfaces being eccentric to the center axis of the door and farthest removed from said axis at the entrance end and closest thereto at the exit end of the casing, whereby the frictional resistance to continued movement of said wings is gradually increased toward the exit end of the casing. 5. In combination, a revolving door havmg radial wings with flex1b1e extensions and a casing comprising opposed members, with curved confronting surfaces between which the door is revolubly mounted, said surfaces being arranged so that said flexible extensions will enter the casing without being brought into substantial contact therewith and will contact with increased pressure on continued forward movement.

6. In combination with a revolving door, a casing having curved confronting walls between which the door is revolubly mounted, said door having radial wings provided with flexible marginal portions arranged to contact with said walls after entering the casing, portions of the opposed contacting surfaces of said walls being arranged to gradually approach the door from the entrance to the exit end of the casing so that the pressure of the door on said walls is gradually increased in the direction of its movement.

7. In combination, a revolving door, and a casing comprising a plurality of substantially concentric sections oif-set at their meeting edges and arranged to form as a whole substantially the arc of a circle eccentric to the center of the door and nearer said center at the exit than at the entrance end of the casing, so that the frictional resist ance by contact of the door with the casing is gradually increased as the wings of the door approach the exit end of the casing.

8. In combination, a revolving door hav ing radial wings provided with flexible extensions, and a casing having opposed con fronting surfaces between which the door is revolubly mounted; said surfaces being arranged to permit the wings of the door to enter the casing without being brought substantially into contact therewith and to contact with increased pressure on continued forward movement from end to endof the casing.

9. In combination, a revolving door having radial wings with flexible extensions and a casing comprising opposed concave members between the concave surfaces of which the door is revolubly mounted, said surfaces being arranged so that the door will enter the casing without touching and be brought into contact therewith, and such contact continued with gradually increasing pressure from beginning to end.

In testimony whereof I aflix my signature in the presence of two witnesses.

DATUS C. SMITH. Witnesses:

H. BIRCKMAYER, B. A. HULL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patentn, Washington, D. 0." 

